2 * QEMU lowRISC Ibex UART device
4 * Copyright (c) 2020 Western Digital
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #ifndef HW_IBEX_UART_H
26 #define HW_IBEX_UART_H
28 #include "hw/sysbus.h"
29 #include "chardev/char-fe.h"
30 #include "qemu/timer.h"
31 #include "qom/object.h"
33 #define IBEX_UART_TX_FIFO_SIZE 16
34 #define IBEX_UART_CLOCK 50000000 /* 50MHz clock */
36 #define TYPE_IBEX_UART "ibex-uart"
37 OBJECT_DECLARE_SIMPLE_TYPE(IbexUartState
, IBEX_UART
)
39 struct IbexUartState
{
41 SysBusDevice parent_obj
;
46 uint8_t tx_fifo
[IBEX_UART_TX_FIFO_SIZE
];
51 QEMUTimer
*fifo_trigger_handle
;
52 uint64_t char_tx_time
;
54 uint32_t uart_intr_state
;
55 uint32_t uart_intr_enable
;
59 uint32_t uart_fifo_ctrl
;
60 uint32_t uart_fifo_status
;
63 uint32_t uart_timeout_ctrl
;
68 qemu_irq tx_watermark
;
69 qemu_irq rx_watermark
;
73 #endif /* HW_IBEX_UART_H */